Not sure what to call it really, but basically you start the game mode with nothing apart from a knife. There's guns all around the map that have dropped or spawn after a certain time. (kind of like CoD:MW's Old School Mode if you've ever played it). Everytime you get a kill you also get a special effect, it could be speed, or health regen, or armor (golden hearts) or something else I have no idea. It would be a Free For All game mode.

I think this would be pretty fun to b honest, and it's unique and not like your other gamemodes.